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When to See a Doctor If youre experiencing persistent fatigue, neurological issues, or muscle weakness, its important to consult a GP for a blood test to confirm your B12 levels

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It is intended for use in clinical settings where oral administration is not feasible or where higher plasma concentrations are desired, such as in cases of severe deficiency, certain infections, or as adjunctive therapy in specific medical protocols

10.1038/ejcn.2017.132 [DOI] [PMC free article] [PubMed] [Google Scholar] Smeyne M., Smeyne R

Theranostics 10 , 51075119 (2020)